Fix yaml validation error with extra colon in github template file

.github/ISSUE_TEMPLATE/config.yml

@@ -2,7 +2,7 @@ blank_issues_enabled: true
 contact_links:
   - name: MVVM Toolkit, High Performance, or Diagnostic Package? 
     url: https://aka.ms/toolkit/dotnet
-    about: If you have a question on these, see the .NET Community Toolkit repo:
+    about: "If you have a question on these, see the .NET Community Toolkit repo:"
   - name: Question
     url: https://github.com/CommunityToolkit/WindowsCommunityToolkit/discussions/categories/questions-help
     about: I have a question about how to use something in the toolkit.